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They use a special UA for this an accessed both websites inquired with that UA.
The requests have ceased at one site, however contine at the other. (eating 403's).
Possibly the bot is stuck in loop because it cannot read robots.txt (I'm using SetEnvIf).
The reply requested notification if spidering continues and I have notified Google and added the additional log lines, after the contact time.
In any event I'm not about to make changes on Google's behalf until the spidering attempts cease as I have no desire for my images in that SE.
Don